1. Phase I: Ergonometric evaluation and serology: Phase I is based on community based randomized controlled trial with three arms. List of households with child aged 6-12 months will be retrieved from demographic surveillance system. Train CHWs will visit the household and provide relevant information regarding the study to the parents. The children of the parents who provide written informed consent will be screened for eligibility and enrolled into the study. The children accompanied with parents/guardians will be carried to the primary health center of the Dept. of pediatrics and child health, AKU. Baseline 3ml of blood will be collected by trained study phlebotomist in EDT tubes and will be transported to infectious disease research laboratory (IDRL) at AKU. A sample of 450 children will be randomized using sealed envelopes into one of the three study arms. Arm 1, will receive fIPV using WestPharma device, arm 2 will receive fIPV using Star ID syringe and arm 3 will receive fIPV using BCG syringe. The child will be observed for 30 minutes for any adverse event. The research Assistants will interview the parents to fill the socio-demographic questionnaire and vaccinators will fill ergonometric and injection quality questionnaires. The child will be followed after 28 days (4 weeks) of enrollment and another 3ml of blood will be collected by trained phlebotomist. Details of the visit will be recorded in follow-up questionnaire. Both baseline and endline blood samples will be tested for immune response against polio virus 1,2 and 3.